[amd64] dtrace_invop handler is to be called only for kernel exceptions
DTrace-related exceptions in userland code are handled elsewhere. One practical problem was a crash in dtrace_invop_start() when saved %rsp pointed to a virtual address that was not backed. i386 code already ignored userland exceptions. Reviewed by: markj, kib MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D5906
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@ -211,6 +211,8 @@ alltraps_pushregs_no_rdi:
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* interrupt. For all other trap types, just handle them in
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* the usual way.
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*/
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testb $SEL_RPL_MASK,TF_CS(%rsp) /* Did we come from kernel? */
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jnz calltrap /* ignore userland traps */
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cmpl $T_BPTFLT,TF_TRAPNO(%rsp)
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jne calltrap
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